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How to change your Minecraft world’s biomes

This happened to me the other day: I have this awesome Minecraft world (my main map), on which I’ve built a bunch of awesome cities with a few friends. Now, the problem arose when I decided that I wanted to build a snow-themed village. You see, my map doesn’t have any snow biomes within a few thousand blocks of the spawn point. Since there was no way in hell that I would start over on a new map, I set off to fin a way to change an existing Mineraft world’s biomes.

Let’s say we have this nice little map that we want to change into a snow world:

The first thing we need to do is to download and install a program called WorldPainter, which is available here: http://www.worldpainter.net/